US3835537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved cutting tool
Assignee: Gillette Co LLC
•
Filing: 1973-03-19
•
Granted: 1974-09-17
•
Expires: 1993-03-19
Abstract
Abstract The sharpened edge of a cutting implement such as a razor blade is modified by subjecting the cutting edge to ion bombardment and strengthening material deposition steps so that a portion of the deposited strengthening material is removed, the cutting edge of the implement having a resulting tip radius of less than about 400 Angstroms and added strengthening material on the flanks so that at a distance of 6,000 Angstroms from the tip the added material has a total thickness of at least about 400 Angstroms.
Inventors
- 👤 A Sastri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:03
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5826; C23C14/5833; B; B26; B26B; B26B21/00; B26B21/54; B26B21/56; B26B21/58; C23C14/5873
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A cutting implement having a cutting edge, the tip of which has an average radius of less than about 400 Angstroms, said cutting implement comprising a substrate having an edge with a tip radius of less than 500 Angstroms and added material metallurgically different from the material of said substrate on the tip and flanks of said substrate edge, said added material having a total thickness of less than 400 Angstroms on the tip of said substrate edge and a total thickness of at least 400 Angstroms on the flanks of said substrate edge at a distance of 6,000 Angstroms from the tip of said cutting edge, the total thickness of the added material at a distance of 1,000 Angstroms from the tip of said cutting edge being less than the total thickness of the added material at a distance of 6,000 Angstroms from the tip of the said cutting edge.
Claim 2
Dependent Claim
151 words
A cutting implement having a cutting edge, the tip of which has an average radius of less than about 400 Angstroms, said cutting implement comprising a substrate having an edge with a tip radius of less than 500 Angstroms and added material metallurgically different from the material of said substrate on the tip and flanks of said substrate edge, said added material having a total thickness of less than 400 Angstroms on the tip of said substrate edge and a total thickness of at least 400 Angstroms on the flanks of said substrate edge at a distance of 6,000 Angstroms from the tip of said cutting edge, the total thickness of the added material at a distance of 1,000 Angstroms from the tip of said cutting edge being less than the total thickness of the added material at a distance of 6,000 Angstroms from the tip of the said cutting edge.
Claim 3
Dependent Claim
16 words
The cutting implement as claimed in claim 1 wherein said cutting implement is a razor blade.
Claim 4
Dependent Claim
17 words
The cutting implement as claimed in claim 2 wherein said added material is a chromium containing alloy.
Claim 5
Dependent Claim
14 words
The cutting implement as claimed in claim 2 wherein said added material is chromium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |